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3 June, 22:52

9) Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?

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  1. 3 June, 23:04
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    60°

    Explanation:

    In the given question it is given that the two mirrors perpendicular to each other.

    The light ray will reflect off the first mirror with an angle of 30° (∠i = ∠r) and then arrive at the second mirror. Using geometry of the two mirrors and the fact that the angle between the two of them is 90°, the incident angle for second mirror is 60°, which will again equal to the angle of reflection.

    hence, angle of reflection of second mirror is 60°
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